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whisper-air-pumpMy Whisper air pump has been going nonstop for 3 months without an issue. I understand that placing a piece of cloth beneath the pump makes it even quieter, but I haven't tried that yet. Currently, it is louder than my AC HOB. Based on the Amazon reviews, there may have been a bad batch of these pumps that have weak diaphragms. Once a diaphragm tears, the replacement part must be ordered with a kit of parts that may cost almost as much as a new unit. I will keep my fingers crossed and repost here if I have a problem.